Culpeper, Va. ? A bomb threat shut down an entire school district Thursday, canceling classes for more than 7,200 students in eight public schools, as well as hundreds more in area religious schools and child care centers.

Culpeper Sheriff H. Lee Hart said the threat, which came on the heels of three deadly U.S. school attacks in the span of a week, was called into the county’s communications center about 11:30 p.m. Wednesday.

“The individual had a lengthy conversation, and in this conversation he said he was going to blow up schools,” Hart said. “We do not know which schools or his plans. We don’t know a lot about this individual.”

Schools will reopen today. Extra patrols were expected when classes resumed today and at homecoming festivities tonight.